"The security certificate was issued by a company you have not chosen to trust. View the certificate to determine whether you want to trust the certifying authority."
If you manage Microsoft Outlook in a corporate environment, or even just use it for business email, you have likely stared at that dreaded pop-up: "The security certificate was issued by a company
Your company uses Microsoft Exchange Server on-premise. The server presents a self-signed certificate or one issued by your internal Microsoft PKI (Certificate Services). Your personal computer doesn't know your company's internal CA. Outlook sees "Issued by: Contoso-Internal-CA" and thinks, "I don't know Contoso. I never agreed to trust them." "The security certificate was issued by a company